Wheeled scraper



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May 23, 1939- -T` Rf PAuLsEN Er AL 2,159,045

WHEELED SCRAPER Filed March 15, 1937 2 Sheets-Sheet 1 l Z5 44 7* ze l [g4 '(4 f8) H 3( .519 117 BY gnvn, if' @WM ATTORNEYS.

May 23, 1939 T. R PAULSEN ET AL 2,159,045

WHEELED S CRAPER Filed March l5, 1937 2 Sheets-Sheet 2 INVENTORS,

BY 1 @MAM ATTORNEYS.

Patented May 23, 1939 PATENT OFFICE:

WHEELED SCRAPEB.

Thomas R. Paulsen and Horace C. Beitlel, South Milwaukee, Wis., assignors to Bucyrus-Erie Company, of Delaware South Milwaukee,

Wis., a corporation Application March 15, 1937, serial No. 130,933

comms.

Our invention relates -to new and useful irnprovements in wheeled scrapers, and more particularly'to that type of such Scrapers in which the bowl both fills and dumps at its forward end. Such a. scraper is shown in United States Patent No. 2,088,091, issued July 27, 1937, to Stanley S. Moore, on application Serial No. 4,064; and our present'invention is an improvement over said patent.

In devices of this sort, the bowl is hung both 4front and rear from the carrying frame, in such a way that a single lifting means, applied to the rear hanger, operates through a complicated linkage or its equivalent, to raise the front lgiger in a predetermined relationto the motion of the rear hanger.

An. "apron is provided t close the front end of the bowl when in its carrying (i. e., intermediate) position; and this apron opens automatically in both the digging position and the dumping position.

Although these functions have been attained in the Moore patent with a fair degree of satisfaction, we have found it desirable to effect the following improvements.

We connect the hoisting rope at a different point than Moore does, thereby obtaining a greater leverage with fewer reaches of rope at that part of the digging cycle when leverage is needed, and yet obtaining greater speed when speed is needed: a seeming paradox. v

We provide a new and ingenious means for supporting and for automatically'xopening the apron, this-means being adjustable to attain different degrees of opening. l

We reeve the bowl-hoisting rope in such locations asto free it from spillage of dirt and stones,

which would otherwise cause clogging and/or undue wear.

In addition to our principal objects, above stated, Awe have worked out a number of novel and useful details, which will be readily evident as the description progresses.

Our invention consists in the novel parts and in the combination and arrangement thereof, which are defined in the appended claims, and of which one embodiment is exemplified in the accompanying drawings, which are hereinafter particularly described and explained.

Throughout the description, the same reference number is applied to the same member or tov similar members.

Figure 1 is a plan view of one form of scraper, shown in the carrying position, taken along the lines I-I of Figure 3.

- I5 along its front lower edge.

Figure 2 is a side elevation of the same scraper, in the digging position.

Figure 3 is a side elevation of the same scraper, in the carrying position, taken along the line 3-3 of Figure 1.

Figure 4 is a side elevation` of the same scraper, in the dumping position.

In the figures, we see that I I, I I are side beams of the frame of the scraper. These are shown broken oifat the right hand side of the figures, but in practice they extend to a forward wheel or wheels (not shown) of any convenient sort, and/or to a draw-bar (not shown) for attachment to the tractor which is to pull our scraper.

Beams I I ,are joined by cross-beam I2. The frame is supported by wheels I3, preferably rub.- ber-tired.

The bowl Il is a boxlike structure, open at the top and front, and provided with a scraping blade The bowl is supported on each side `at two points I6 .and I1, by bent link I8 and link I9 respectively. Bent link I8 is in turn supported by hoist rope 20, the reeving of which is as follows.

It passes from an anchorage 2|` on the frame, over sheave 22' on one of the two elevated arms 23, thence over sheave 24 on one of the bent links I8, thence over sheave 25 on the elevated arm, thence over sheave 26 on the bent link, thence over swiveled sheave 21 on cross beam I2, thence across to the other side of the scraper to swiveled sheave 28, thence over sheave 29 on the other bent link I8, thence over sheave 30 on the other elevated arm 23, thence over sheave 3l on the bent link, thence over shea've 32 on the elevated arm; thence over deflecting sheave 33, and thence to the forward end of our scraper, where (by means of other sheaves, not shown) it is led to the winch (not shown) on the tractor (not shown) which pulls our scraper. g

It should be noted that this reeving keeps the rope 20 and its sheaves free of the spillage of dirt at the rear and sides of our bowl. l

The link I9 is pivotally hung fromone corner of triangle 34. Bent link I8 is-pivotally attached to a second corner of this triangle, and the tri- 1 angle is pivotally supported by the-frame at 35.

Toggle arm 36 is pivoted to the frame at 31 and to the bowl at I6.

Apron 38 is supportedas follows. Apron arm 38 is pivoted to the frame at 35. Rope 40, attached to the apron at III, passes over a sheave 42 carried by the frame, and thence to an anchorage on cam 43, secured in any one of a number of selective positions on link I9.

All the foregoing linkage is duplicated on the further side of the scraper.

Adjustable stops 44 limit the descent of the bowl, and adjustable stops 45 limit the descent of the apron.

The operationof our scraper is as follows.

When the scraper is nin the digging position of Figure 1, the reaction of the ground against scraping blade I5, tends to force point I6 downward, due to the fact that the bowl I4 and toggle arms 36 are below toggle. This tendency is :resisted by rope I2li, and hence the depth of digging can be regulated (subject to the limiting eiect of stops 44) by paying out rope 20 or hauling it in.

The location of sheaves 24, 26, 29 and 3| on bent links I8, rather than on the rear of the bowl as in the Moorepatent, or on the toggle arms 36, as sometimes practiced, gives greater leverage than Moore during digging and carrying, and greater speed than Moore during dumping.

When rope 20 is hauled in, point I6 on the bowl rises in a circle about point 3l on the frame as a faster than point I1, that the scraping blade I5 actually lowers again, thereby serving as a spreader for the material which is being dumped. Y

Meanwhile what of the corresponding cycle oi the apron? In Figure 2 the low position of link I9, acting on the rope 40, holds the apron 38 elevated. v

As the link I9 rises to its position of Figure 3, the apron correspondingly lowers until it closes the front of the bowl. The extent of its descent is limited by stops 45, which also serveto relieve the scraping blade I5 from having to support the apron and its contents during carrying.

But as the link i9 moves to its position of Figure 4, its rise or descent is negligible, and hence the rocking motion of cam i3 is provided, so as to take in rope d, thereby raising the apron again.

The automatic operation of the apron can be nicely regulated by changing the length oi' rope dii, the adjustment oi stops 5, the location oi porting? the front of the 'bowl from the frame,

additional brace meansfconnecting the bowl to the frame, to convey the digging reactions from the' bowl tothe frame, and to cooperate with the connection about to'be described; and an interconnection between the lifting means and the hanging means such that the lifting of the bowl at the back from the digging position will cause the hanging means to rise, but to ay lesser extent than the back of the bowl, whereby to finally clis-l `pose the bottom of the bowl at a steep angle for dumping, characterized by the fact that the interconnection includes two links, one of which is pivoted to eachside 4of the bowl adjacent the rear thereof, and each of which is operatively associated .with the hanging means, and by the further fact that the lifting means is applied to these links at a point above the attachment of each link to the bowl, and from such a point on the frame that the direction of pull in the dumping position will .pass above the point of attachment of the link tothe bowl.

\2. A scraper, according to claim l, characterized by the still further fact that the lifting means is exible and passes around sheaves mounted on the links.

3. A scraper, having a frame, ground-supports for the frame, a digging bowl, lifting means applied only at the back of the bowl, hanging means separatefrom said lifting means for supporting the front of the bowl from the frame, additional brace means connecting the bowl Yto the frame,

to convey the digging reactions from the bowl to the frame, and to cooperate with the connection about to be described; and an interconnection between Sthe lifting means and the hanging means such that the lifting of the bowl at the back from the digging position will cause the hanging means to rise, but to a lesser extent than the back of the bowl, whereby to nally dispose the bottom of the bowl at a steep angle for dumping, characterized by the fact that the hanging means includes two links, one of which is pivoted to each side of thebowl adjacent the front thereof, and by the possession of the following further elements: an apron, capable of closing the front of the bowl when it is in carrying position; means independently pivoting this apron on the frame for opening and closing;

and flexible means passing from an anchorage on the apron, over a sheave on the frame, to such the link is such that the descentof the link, as

the bowl descends from. its carrying position to its digging position, pulls on the flexible means, and that the rocking of the link, as the bowl rises from its carrying position to its dumping position, is aimaient to offset the rise ofthe link and thereby pull on the exible means.

6. A scraper, having a frame, ground-supports for the frame, a digging bowl, lifting means applied only at the back of the bowl, hanging means separate-from said lifting means for supporting the front of the bowl from the frame, additional brace means connecting the bowl to the frame,

to convey the digging reactions from the bowl to the frame, and to cooperate with the connection about t'o be described; and an interconnection -between the" lifting means and the hanging means such that the lifting of the bowl at the back from the digging position will cause the hanging means to rise, but to a lesser extent thanv the back of the bowl, whereby to finally dispose the bottom of the bowl at a steep angle for dumping, characterized bythe fact that the interconnection includes two links, one of which is pivoted to each side of the bowl adjacent the rear thereof, and each of which is operatively associated with the hanging means, and by the further fact that the lifting means is applied to these links at a point above the attachment oi' each link to the bowl, and from such a point on the frame that the direction of pull will pass above the point of attachment of the link to the bowl in the dumping position, and behind this point of attachment in the digging position.

THOMAS R. PAULSEN.

HORAACE C. BEITZEL. 

